As we previously reported, beloved director and producer Garry Marshall passed away on Tuesday evening due tocomplications of pneumonia, not long after he had suffered from a stroke, in a hospital located in Burbank, CA. He was 81 years old.

Marshall is best known for launching many actors' careers through his hits like Pretty Woman, The Princess Diaries, Beaches, and more. So it's no wonder that this death quite an impact on Tinseltown. In fact, many A-listers have since taken to Twitter and Instagram to mourn the late industry vet — including Rob Lowe, Mandy Moore, Kathy Bates, and countless others.

The Simpson sister's were accompanied by their husbands and were spotted sipping wine and cocktails throughout the event. An onlooker told People:

"Ashlee and Evan [Ross] acted like newlyweds. They were cuddled up together in a booth, laughing and showing off cute PDA. Jessica looked really happy to be hanging out with them and seemed to get along great with Evan. Eric [Johnson] and Jessica did their own thing at the party and would check in on each other every now and then. He came over to introduce himself to her friends a few times and would run close to the stage to take photos of the performances."

As for the returningVoice judge, she pushed through her sickness to support Perry:

"Her fiancé [Matt Rutler] held her hand on the way up. She said she was getting over the flu but wanted to come and support Linda."